在子节点上设置:SelectAction为Expand;Expand为false
注意不是树控件上
示例代码:
TreeNode t1 = new TreeNode(); t1.SelectAction = TreeNodeSelectAction.Expand;
t1.Expand=false; t1.Text = "新加"; TreeNode t2 = new TreeNode(); t2.Text = "新加下"; t1.ChildNodes.Add(t2); TreeView1.Nodes.Add(t1);